You could have runts and grunts.
If you're talking about goblinoids in the D&D sense, those are usually goblins, hobgoblins and bugbears. (D&D follows a mistake in translation perpetuated in early Fantasy literature, that goblins are smaller and hobgoblins are larger. Actually, hobgoblin implies small, since a hob is a type of tiny spirit creature, so it should go the opposite way.)
Borrowing from D&D again, there are half-orcs. In D&D4, they proposed that half-orcs are not (necessarily) the biological result of breeding an orc and a human, but rather, they are a distinct race with unknown origins that is half-way between an orc and human in size and temperament. Following the same logic, you could have something that's like a double-orc or ogre-orc, bigger and meaner than a normal orc, but even stupider.
You could also have orcs (or goblins) that have some sort of lineage to powerful beasts, like a demon-kin, dragon-kin, elder-kin (i.e. Cthulu), jotun-kin, oni-kin, trent-kin, naga-kin, asura-kin, ifrit-kin, marid-kin, and so on.
There are a lot of mythical types of trickster spirits and poultergeists that could pall around with goblins. Puck, boggart, hob, brownie, kobold, powrie, gremlin, imp, tengu (are sometimes thought of as goblins), nilbog, pukwudgie, gnome, genoma, leprechaun, kobaloi, pixie, etc.
And there's always colors. Blue goblins, black orcs, etc. Or biomes. Swamp orc, mountain orc, sand goblin, ice goblin, etc.
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Topic: Ideas for orc castes? (Read 1092 times)